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I think you're safe with either of those. Both are from push-pull amps that used power tubes from the same family as the UniAmp. The Dynaco is 4.3K primary impedance, I'm pretty sure, so it will allow the amp to produce more power. Not sure about the HH Scott, but their OPTs are legendary.

Using those instead of the 6.6K that Mr. Millett recommends may call for you to change the B+ a bit and a couple of resistor values to run at the optimum.

Someone with more knowledge than I will have to chime in on what those changes might be.

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